The JSDM approach was presented in terms of two methods, the joint-group processing (JGP) and PGP [1]}. JGP can be applied in the case that the estimation and feedback of the whole matrix from all UEs in all groups are affordable. Normally, the JGP method is accompanied by prohibitive overhead for channel estimation and feedback while PGP is more advantageous due to lower overhead. For this reason, the PGP method, summarized below, is suggested as a more practical approach and is employed in this work.
